Measuring instrument



H. F. GALLAGHER.

MEASURING INSTRUMENT. APPLICATION FILED JUNE 29. 1918.

1 34 4 Patented July 13, 1920;

PATENT OFFICE.

HUGH F. GALLAGHER, F PORTLAND, MAINE.

v MEASURING msrnumnm'.

T 0 aZZ w/wm, it may concern:

Be it known that I, HUeI-I F. GALLAGHER,

I a citizen of the United States, and resident of Portland, in the county of Cumberland and State of Maine, have invented certain new and useful Improvements in Measurlng Instruments, of which the following is a specification.

This invention relates to improvements in measuring lnstruments, and It is the pr1nc1-.

pal object of the-invention to provide a novel form of dividing instrument whereby a surface or other article of work can be evenly divided into a plurality of parts; markings'being made on. said surface or article of work in equidistant relation."

It is also an object of theinvention to provide a dividing instrument which can be easily and quickly adjusted to the desired position or size and also, minutely adjusted to render the same positively accurate and efficient. Y

'Other objects will be in part obvious and in part pointed out hereinafter.

The improvements in the details and ar-,

rangement of ,parts will be apparent from an inspection'of the accompanying drawings, when considered in connection with the specific description hereinafter contained, and wherein a-preferred embodiment of the invention is shown for the purpose of imparting a full understanding thereof.

In the drawings:

.Figure 1 is a side elevation of the improved ,instrument, and t Fig. 2 is a detail in elevation of the adjusting nut used in connection therewith.

Having more particular reference to the drawings, in connection with whichlike reference characters will designate correspond.- ingparts throughout the several views, the improved instrument includes a plurality of crossed arms generally indicated by the numeral 1, said arms having their adjacent ends and the intermediate portions thereof pivotally connected as at 2 and 3, thus providing the usual lazy-tongs construction.

Marking members 4 are provided, and as will be. noted, have certain of the ends there of pointed as at 5, while elongated slots 6 are formed in the opposite'portions thereof,

and receive the pivotal connections of certain of the ends ,of the crossed arms 1 therein in a manner to permit sliding movement of the same with relation thereto; it being Specification of Letters Patent.

Patented July 13,1920.

Application filed June 29, 1918. Serial No. 242,520.

noted in this connection, that the pivotal connections of the remaining ends of said arms l are engaged with portions of the marking members 4 at points in proximity to the pointed ends 5 thereof. To facilitate the proper marking of the surface or article of work, guide lines 6' may be and preferably marking members 4 adjacent the pointed ends 5 thereof, as clearly shown in Fig. 1.

.are formed on the opposite sides of the Nuts 7 and 8 are engaged with portions of the arms 1, as shown in Fig. 1, and receive a screw-threaded adjusting rod 9 therein, said rod being formed with a head 10 to facilitate rotation of the same. Obviously,

by engaging the screw-threaded adjusting rod 9 in the nuts 7 and 8 which are immovably mounted on the arms 1, I am enabled to effect very minute and if necessary microm eter adjustment 'of the marking members 4 with relation to each other, as desired, merely by rotating said rod.

To permit of quick adjustment of the instrument, the nut '8 is formed in sections-pivotally connected by means of links 11 arranged adjacent certain of their ends, while a spring latch arm 12 is arranged on the opposite end ofone of said sections, and has its hooked free end engagingthe second section to releasably hold the same in operative position, thus -maintaining the screwthreaded bore of the nut 8 in engagement with the screw threads formed on the adjusting rod 9. When desiring to quickly adjust the instrument, it is only-necessary to disengage the threads of thebore of the nut 8 from, the threads of the adjusting rod 9 by moving the sections of said nut 8 away from the same, whereupon the adjusting rod can be moved inwardly or outwardly to effect the proper adjustment of the marking members 4 with relation to each other.

Minute adjustments of the marking membersare, of course, obtained through the medium of the adjusting rod 9, that is, the en e rr In using the improved instrument, greater adjustments thereof are; obtained by disenof the same with the nuts 7 and 8 and the rotating thereof.

members 4: can, of course, be measured to ascertain when the proper adjustment therebetween has been obtained, by merely P1216,

ing a rule or similar measure adjacent the same. For this purpose, I may and preferably do secure to one of the outermost marking members a rule 13 riveting one end thereof to the marking members as at 14 while the remaining or free end thereof is extended longitudinally of the instrument and is adapted to be alined with the markings 6 on the adjacent marking members 4, thus indicating when the proper adjustment between the marking members has been secured. v

Manifestly, the construction shown is 021* pable of considerable modification, and such modification as is within the scope of my claim I consider within the spirit of my invention.

. I claim:

An instrument of the character described including crossed pivotally interconnected arms having marking members engaged therewith,a screw threaded adjusting rod rotatably engaged at one end with certain of the interconnected arms, an internally screw threaded block mounted on certain of the interconnecting arms and formed in two sections} one of said sections being pivotally connected with the other of the sections, and a spring catch for holding said block sections together to form substantially a micrometer adjustment with the screw threaded rod, and for releasing the pivoted block to permit of quick adjustment of the marking members.

In testimony whereof, I aflix my signature hereto.

' HUGH F5 GALLAGHER. 

